For most players putting accounts for 40 to 50 percent of their total strokes. Considering this it certainly makes sense to be fitted for your putter rather that buying a random one off the rack. Three important factors are length, lie and loft. Proper length is based on your height, wrist to floor length and putting posture, i.e. do you crouch over like Jack Nicklaus or stand taller like Tiger Woods. Lie angle is the angle between the putter shaft and the ground. If your putter sits with the toe up the heel can catch the ground and twist the putter face closed. The opposite can occur it the putter is too flat. Putters have an average of 3 degrees loft on the face. Depending upon the amount of negative or positive shaft lean you have at impact your putter may need more or less loft to create a proper roll.
The iPing Putting App is an excellent tool in determining the right specifications for your putter. I use it in all my putter fittings. Call the shop to schedule an appointment and learn how a custom fit putter can save you strokes on the green.